fix: conflict source map support

[whxaxes]

Checklist

• npm test passes
• tests and/or benchmarks are included
• documentation is changed or added
• commit message follows commit guidelines

Affected core subsystem(s)

pick from #181

Description of change

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (4.x@a1fb829). Click here to learn what that means.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             4.x      #182   +/-   ##
=======================================
  Coverage       ?   100.00%           
=======================================
  Files          ?        13           
  Lines          ?       257           
  Branches       ?         3           
=======================================
  Hits           ?       257           
  Misses         ?         0           
  Partials       ?         0           

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[fengmk2]

@whxaxes 你来发个版本。

[whxaxes]

• egg-bin@4.19.2